inhaler (canister containing medicine)

(mechanics) aerodynamics

(exercise) wall squat / A group activity where a ring of people attempt to maintain the position of "sitting" on the lap of the person behind them.

(colloquial) current boyfriend

air gun

(colloquial) unable to pick up on social cues or the situation; lacking social awareness or situational awareness

compressed air

everything

emotional atmosphere

to sense or guess the mood or atmosphere of one's surroundings; to read the room